How many exhaust gaskets?

MexicoMike · Feb 13, 2010

My 850 requires 3 exhaust gaskets in order to ensure the exhaust nut doesnt' bottom out before sealing the exhaust. Actually, it's 2 on one side, 3 on the other. The two exhaust nuts look the same externally but the threaded portion on one is maybe 1/8" or slightly more shorter than the other. Do other folks see this as "typical"? The head's exhausts have had inserts installed by a PO so they work fine as far as threading but I don't understand why the multiple gaskets are required or why one nut has a shorter threaded area. Can't see that it really matters but it's one of those things I find annoying...

Hortons Norton · Feb 13, 2010

There are two types, Maybe try the longer ones?

MexicoMike · Feb 13, 2010

I was figuring on getting the Colo Norton works exhaust nuts at some point though I have no idea of how much "depth" they have and whether they would eliminate the need for multiple gaskets. Or is that a function of the header pipes themselves... the thickness of the pipe mounting flange would affect this as well.

swooshdave · Feb 13, 2010

MexicoMike said:
I was figuring on getting the Colo Norton works exhaust nuts at some point though I have no idea of how much "depth" they have and whether they would eliminate the need for multiple gaskets. Or is that a function of the header pipes themselves... the thickness of the pipe mounting flange would affect this as well.

Just ask Matt. He'll tell you the exact dimensions. Just PM him on the board or start a thread called "CNW Exhaust Nuts". :mrgreen:

Danno · Feb 13, 2010

Mk IIIs came with conical/flat steel exhaust port washers as opposed to the crushable rings of older exhaust systems. If these have been removed, the pipe flange sinks about 1/4" farther into the port and short-threaded pipe nuts may not be sufficient. If you are interested in trying a pair, I have some that I would let go for postage since the 2-into-1 header on my 850 doesn't need them.

debby · Feb 13, 2010

I use unbalanced pipes and 750 exhaust nuts on both bikes. The 750 nuts are longer and don't bottom out. Only one gasket needed per side!

Debby

rick in seattle · Feb 13, 2010

Hi Mike,

Like Debbie, I use 750 pipes and nuts on my Mk3. Like yours, I also had new inserts installed. While I need only a single washer per side to seal, Ella at Old Brits insisted on sending me a pair per side, saying that many Mk3 owners needed more than one to avoid bottoming the nut, so I suppose it is a common problem on 850s.

pelican · Feb 13, 2010

the cnw ones are long enough...put mine on the other week...i've got 3 or 4 threads left on mine sticking out of the head

BrianK · Feb 13, 2010

I'm using 750 head pipes and exhaust nuts on my 850, with NO gaskets. Seems to work fine. Am I screwing something up?

DogT · Feb 13, 2010

Brian,
Probably not, if all is working fine.

Dave
69S

BrianK · Feb 13, 2010

Seems to be, Dave; thanks.

I'd still like to find a little copper crush washer type of gasket for in there, but haven't bothered looking as it seems to work.

Best - BrianK

maylar · Feb 14, 2010

I highly recommend a steel crush washer from Suzuki, this tip was published in the Norton Tech Digest some years ago. Suzuki P/N 14181-01D00 avaiable from dealers and online parts sources. Way better than the copper types and thick enough that the 850 exhaust nuts fit without bottoming out. I won't use anything else.

BrianK · Feb 14, 2010

Thanks for that part number Dave, I ordered up a couple. Since the pipes'll be coming off soon for my ring job, I might as well put some exhaust gaskets in when I reinstall 'em. Seems to have worked just fine without them but I'll feel a bit better with some in there. Not sure why....

Thanks all. - BrianK

How many exhaust gaskets?

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